Method or process of nurling.



E. A. BARDWELL.

METHOD 0R PROCESS OFNURLING.

APPLICATION FlLD1uNE|9.19l1.

1,273,441. Patented July 23,1918,

WITNESS: IN VEN TOR.

aa @WM A TTORNE Y.

' metal is still in a hot condition.

UNITED STATES PATENT OFFICE.

EDWIN ALLEN BARDWELL, 0F SHELBURNE FALLS, MASSACHUSETTS, ASSIGNOR TO H. H. MAYHEW COMPANY, 0F SHELBUBNE FALLS, MASSACHUSETTS, A CORPO- RATION or MASSACHUSETTS.

METHOD OR PROCESS 0F N URLIN G.

Specification of Letters Patent.

Patented July 23, 1918.

To all whom t may concern:

Be it known that I, EDWIN ALLEN Balu WELL, a citizen of the United States of America, residing in Shelburne Falls, in the count. of Franklin and State of Massachusetts, ave invented certain new and useful Improvements in Methods or Processes of Nurling, of which the following is a specification.

This invention relates to improvements in the method or process of hurling or embossing the cylindrical body of a percussion tool, as a nail set, the embossing being carried out during the process of forging the tool under the power hammer and while the The process consists in first forging the tool to the required shape, then subjecting the same, while still in a hot condition, to the process of nurling or embossing to produce the usual nurled effect on the grip part of the tool.

Heretofore, it has been a common' practice to produce the nurling on the body portion of the tool by means of a nurling tool which includes cutters having cutting surfaces of various designs. Such cutters are held :against the body portion of the tool while it is revolved by any` suitable means and until the nurled surface is completed. The nurled surface has also been produced by forging, produced was irregular and in rectangular planes or lines. In the present invention the nurling or embossing is produced by means of two dies which simultaneously engage the oppositely located surfaces of the body portion composing the tool, said dies having corrugations or cutting ridges which extend in thesame direction on the adjacent or opposite faces, or, 45 degrees to the side edges of the respective upper and lower dies. The purpose of embossing the tool is to produce a hand gripping surface, whereby theworkman is enabled to better grasp the tool while using the same.

Referring to the drawings:

Figure 1 shows, conventionally, the upper and lower dies which are used in a power hammer or press, showing the cutting ridges arranged at an angleof 45 degrees to the sides of the dies and extending in the same direction with respect to each other and illustrating at the left of the figure a rectangular shaped p iece that has been subjeeted to embossing or hurling blows,

but the shape of the nurling4 whereby the metal is formed with ridges on its oppositie faces;

Fig. 2 illustrates the embossing or nurling on the four faces of the tool, the intersecting ridges composing the embossing being at 90 degrees to each other;

. Fig. 3 shows the same embossing or nurling on a circular piece of metal, as applied to the gripping surface of a nail set;

Fig. 4 illustrates a pair of dies that are shown in contact at one edge thereof and spaced away or separated at the opposite side edge where the embossing ridges are formed, and showing the manner 0f embossing a circular percussion tool, the full lines at the right representing the position of the tool `before it is rolled to the inside part of the die where it is shown in full lines.

Referring to the drawings in detail: 1 designates the upper die and 2 the lower die, the upper one being considered as mounted in and secured to the vertically reciprocating part of a power hammer. The die 2 is secured in a fixed position in the machine or power hammer. The contiguous, opposite and adjacently located embossing surfaces of the dies are formed with cutting ridges which are arranged at 45 degrees to the side edges of the dies, as indicated at 3 and 4, Fig. l, and in the same direction, with the result that the serrations or cutting ridges on the oppositely arranged faces of 'the dies extend in the same direction.

The piece of metalthat is to have a portion of its surface nurled is shown at the left of Fig. l at 5. This piece is first forged to the required shape by inserting the same between the surfaces l1 and l2 of the dies shown in Fig. 4 and while still hot is insorted between the dies l and 2, the upper vertically reciprocating die l forming the embossing or nurling indicated at 6 on the upper surface, and the lower fixed die 2 forming the nui-ling or embossing indicated at 7, on the lower surface. The piece is `then withdrawn and the intermediate surfaces 8 and 9 are subjected to the forging or embossing process. The tool or piece is then turned still further or through 180 degrees from its original position producing the finished embossing or nurling effect as indicated in Fig. 2 on the four surfaces or faces, the ridges of which stand aia-90 degrees .to each other, as Shown at l0, The

' Yfaces llland same process is carried out in embossing'or nurliiig ya vcircular percussion tool orf other Referring tof-Fig. 4l the piece is first forged by inserting the same by hand between the smooth surfaces 11 and l'i'and givena'V ingl surfaces 1li-and 15 which extend, asV

showin'substantially r'one half of the distance between' the opposite' right and -left hand edges :of the k the dies jiscor'itr/olled' o'r adjusted at the surorjnioved by hand 'di'lringvthe/verticallyA reciproca.ingl motionof the upper die 1, from the fullline 'positiona lshown 'at the right of lftothefull line position at the innerv ends of'the'cut away portion'between;the*

dies'producingthe embossed effect shown in FiggiB with "thief embossed ridges at 90 degrees to leach'other, the' embossed surface being indicated at 16. It is to be understoodfthat thenieta-l while being subjected to the embossing'.process vals indicatedin Fig. is fstillfhot' thus inalliing iteasy'forthe dies'to emboss or cutlthe ridges lIt is t'cobeunderstood 'that as the operator moves the'piece l13 inward'between the roughened surfaces ofthedi'esl and 2, that either one or Lboth of these dies are reciprocate-d into contact'with the piece 13 and away from thisfv` piece,j thus producing the embossed effect shown iii Fig.

will bejseen from this description that the' process ofA embossing', nurling or imprinting ay percussion tool is very rapidly:

and l' efficiently carried out while the metal tofloeL embossed is still 'hot' and Vthat the em-A 60.\ ,y v A y*parted"jtofthe article-during the forging @'iisfei naar@ 'einem fof @ses witnessing teffccaifissief 'of as ,j

b'o'ssing d'ie's` are so "formed with the cutting rides v,as to produce a finished article in which the embossing'lines or yridges extend the saine. direction thus producing substantiallyth'e same appearance as that produced bythe ordinary tooland at a very` in'ulch expense. It 'is toV be understood thatap'plicant doesV notliinit himself to any specifici 'fltffis obvious' from the above `description that substantially 'a rcircular foimwill be ini- P1606 Cl'rin theyertical movements of The distance. 15 between.

12.l The piece' 13 is then rolled vgroo .I V erin of impijint or design that is toV lg-@flung ucedjen the toojlgas other forms may .n b'e'f u'sedf without departing from `the/spirit the lupper die 1. It is also to be understood that the articleidoes not assumeth'eforinof a perfect circlefduring-ltl'ie 4forging process,

but substantially' a circlebefor'e the article is inserted `between the surfaces 14 and 15.

1. The method of nurling or embossing which''consists7 first, in subjecting' tlie'nie'tal to be embossed to a forging process by means offorging d`ies`toreduce the saine to substantially the dimensions of thesliirished article, nent, subjecting theiinetal composing the article while still hot to the action of forgingdies, the dies used in the forging process being vformed with cutting ridgesz that are arranged at `anfangle vto the side` I edges .of thevdies, and extending inY the same direction, and said articlethat is being enii bossed'being itself rotated abontfitsaxis duringthe embossing process tol` produce a surface on :which the embossed orinurlingi '4 ves intersect each other at any desired angle'.. v 1 u Y. i

, 2, The process of nurling or .embossing an article; which consists in subjecting the saine to a -forging process subjecting/said article tothe action ofthe dies on the :opposite or adjacent facesrof which ridges are formed with cutting .edges7 said ridges extendingk in the same direction, andthen manipulating the articleso that the embossed grooves cut by one diewill be intersected by the embossed grooves cut by the other die.

y 3. The process of embossing an article while in a hot V'conditionv whichconsists, first in orgingtheartiCle Vby means of diesto Y substantially. the dimensions.V of the finished article by inserting the same between a pair of said dies7 then subjecting the article, while still hot, tothe action of Vthe same dies having'embossing-surfaces, the opposite faces.

by meansof dies7 then.

of which" are formed with cutting ridges e whichv extend in the saine direction to the Sdsdses 0f. the dies, whereby es the article.' is rotatedv between the-dies the finished arti-.

cle will .have anvembossed.` surface whose' ridges and grooves intersect each'other, a s

described". l j Y l, t,

4, .The method ofnurling or embossing an articleor tooll as a nail set, which consists in subjecting thestock to aforging` .processV between ia fixed andf a movable die and'V simultaneously imparting a rotating motion,

iio

tothe stock untilthe desired .form iny cross j section is produced, 'then subjecting the stock tothe action' ofva die movable: toward a fiXeddie, the opposite faces offwhich dies c are formed with `ridgesvifor1 indenting their stock and simultaneously rotating'V the stock between the said Vfaces duringeach action,y as described. V,

EDWIN l riiini'in'v Biiiinwiiiiii. 

